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Marcin Woźniak, Wojciech M. Kempa, Marcin Gabryel and Robert K. Nowicki

, pp. 247-261. Kim, K. and Yang, W.S. (2011). Busy period analysis for the GI/M/1 queue with phase-type vacations, Journal of the Korean Statistical Society 1(40): 55-62. Korolyuk, V. (1975). Boundary-Value Problems for Complicated Poisson Processes, Naukova Dumka, Kiev, (in Russian). Korolyuk, V., Bratiichuk, M. and Pirdzhanov, B. (1987). Boundary-Value Problems for Random Walks, Ylym, Ashkhabad, (in Russian). Lee, T.T. (1984). M/G/1/N queue with vacation time and exhaustive service discipline

Open access

Ivan Atencia

Abstract

This paper considers a discrete-time queueing system in which an arriving customer can decide to follow a last come first served (LCFS) service discipline or to become a negative customer that eliminates the one at service, if any. After service completion, the server can opt for a vacation time or it can remain on duty. Changes in the vacation times as well as their associated distribution are thoroughly studied. An extensive analysis of the system is carried out and, using a probability generating function approach, steady-state performance measures such as the first moments of the busy period of the queue content and of customers delay are obtained. Finally, some numerical examples to show the influence of the parameters on several performance characteristics are given.

Open access

Ivan Atencia

Abstract

This paper discusses a discrete-time queueing system with starting failures in which an arriving customer follows three different strategies. Two of them correspond to the LCFS (Last Come First Served) discipline, in which displacements or expulsions of customers occur. The third strategy acts as a signal, that is, it becomes a negative customer. Also examined is the possibility of failures at each service commencement epoch. We carry out a thorough study of the model, deriving analytical results for the stationary distribution. We obtain the generating functions of the number of customers in the queue and in the system. The generating functions of the busy period as well as the sojourn times of a customer at the server, in the queue and in the system, are also provided. We present the main performance measures of the model. The versatility of this model allows us to mention several special cases of interest. Finally, we prove the convergence to the continuous-time counterpart and give some numerical results that show the behavior of some performance measures with respect to the most significant parameters of the system

Open access

Troy L. Harris

the period. This article contributes to that debate. Specifically, it examines a range of contemporary printed sources showing that the constitutional position of the courts of the Church of England remained a divisive subject throughout the mid-1730s at least. At one level, the article represents a companion piece to earlier work quantifying the significant volume of litigation the church courts were handling during the period. See Troy L. Harris, The Work of the Ecclesiastical Courts, 1725-1745 , in , STUDIES IN CANON LAW AND COMMON LAW IN HONOR of R

Open access

Carmelia Mariana Dragomir, Daniel Eduard Constantin, Mirela Voiculescu and Lucian Puiu Georgescu Georgescu

Abstract

One way of monitoring the atmospheric pollution is to estimate anthropogenic emissions. This paper presents a study of PM10 emissions in a city SE of Romania (Braila) for the period 2009-2012. PM10 emissions decrease from 304.75 t in 2009 to 78.01 t in 2012. Using data from the Environmental Protection Agency Braila and the METI-LIS dispersion model, four maps were produced in order to estimate the spatial distribution of PM10 emission in each year. Results of dispersion models show that the air quality can change abruptly between points at few meters away. Expectedly, PM10 emissions increase towards the centre of the city centre, are generally higher in the vicinity of busy streets and roads.

Open access

Christa Lykke Christensen

; Stevenson, Fiona & Jones, Ian Rees (2009). Not Just Old and Sick - the ‘Will to Health’ in Later Life. Age and Society, 29(5): 687-707. Hjarvard, Stig (2016). Mediatization and the Changing Authority of Religion. Media, Culture & Society, 38(1): 8-17. Jeune, Bernard; Lindholm Eriksen, Mette; Andersen-Ranberg, Karen & Brønnum-Hansen, Henrik (2015). Improvement in Health Expectancy at Ages 50 and 65 in Denmark During the Period of 2004-2011. Scandinavian Journal of Public Health, 43(3): 254-259. Katz, Stephen (2000). Busy

Open access

Branislava Matic, Uros Rakic, Verica Jovanovic, Snezana Dejanovic and Nela Djonovic

schools. They were chosen (sampled) to be with heterogeneous characteristics. Primarily, schools were grouped by their location, i.e. the level of their exposure to potential sources of air pollution in their vicinity (be it traffic or industrial facility), as suburb schools, schools in broader urban area, and downtown ones, shown in Table 1 ( 15 ). As for the vicinity of busy traffic, it can be easily comprehended by consulting the GIS map of their address, together with traffic characterisation ( Figure 1 ). The criterion for the choice of a classroom was its

Open access

Robert Ashmead, Eric Slud and Todd Hughes

5. References Bates, N., J. Dahlhamer, P. Phipps, A. Safir, and L. Tan. 2010. “Assessing Contact History Paradata Quality Across Several Federal Surveys.” In JSM Proceedings, Survey Research Methods Section, American Statistical Association, Vancouver, BC, July 31-August 5, 2010. Alexandria, VA: American Statistical Association. 91–105. Available at: http://ww2.amstat.org/sections/SRMS/Proceedings/y2010/Files/306005_55654.pdf (accessed February 2017). Bates, N., J. Dahlhamer, and E. Singer. 2008. “Privacy Concerns, Too Busy, or Just Not Interested

Open access

Dinesh Bhugra

and first set of graduates passed out during this period. In addition to wards being big, often patients had been there for years. An 87-year-old female patient who died in one of the wards had been there since she was 17 years old when she had got pregnant without marriage. Local GPs had contract to visit the wards every 2–3 days to carry out physical examinations and investigations if needed. The consultants were extremely supportive. I was curious about clinical cases, and not surprisingly, the clinical material in the hospital was challenging and interesting

Open access

Gabriele B. Durrant, Olga Maslovskaya and Peter W. F. Smith

://www.statmodel.com/download/AppendicesOct28.pdf (accessed 9 June 2017). Bartholomew, D., F. Steele, I. Moustaki, and J. Galbraith. 2008. Analysis of Multivariate Social Science Data . London: CPC Press. Bates, N., J. Dahlhamer, and E. Singer. 2008. “Privacy Concerns, too Busy, or just not Interested: Using Doorstep Concerns to Predict Survey Nonresponse.” Journal of Official Statistics 24: 591–612. Beadnell, B., S. Baker, K. Knox, S. Stielstra, D.M. Morrison, E. DeGooyer, L. Wickizer, A. Doyle, and M. Oxford. 2003. “The Influence of Psychosocial Difficulties on Women’s Attrition in